Ventilating apparatus



June 1932- A. w. STEWART 1,863,949

VENTILATING APPARATUS Filed May 27, 1929 i 2 Sheets-Sheet 1 FIG- I.-

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A; w. STEWART VENTILATING APPARATUS Filed May 27, 1929 2 Sheets-Sheet 2Patented June 21, 1932 UNITED STATES ALEXANDER WILLIAM STEWAR'LFOFZGLASGOW, SCOTLAND VENTILATING APPARATUS Application filed May 27, 1929,Serial No. 366.232,fan'd in Great Britain August 10, 1928.

This invention relates to improvements in ventilating apparatus of thetype in which air is deliveredat low velocity through a louvre.

In the use of such louvres it is frequently experienced that thevelocity in the trunk or duct to which the louvre is fitted or withwhich the louvre communicates is much in excess of that at which the airis to be delivered from the louvre. 'On account of the high mission fromthe trunk.

air velocity there is liable to be unequal distribution of the airdelivery, the major part of the air being delivered near that end of thelouvre remote from the point of air ad- The object of the presentinvention is to obviate this drawback and insure approximately uniformdistribution of the air delivery.

According to the invention provision is made for splitting into twooppositely directed streams the air flowing to the louvre from thetrunk, one stream flowing from one end of the louvre and the otherstream flowing from the opposite end of the louvre. By suitableadjustment these two streams may be arranged to have equal dynamiceffects so that the pressure is substantially uniform over the entirelouvred surface.

Ventilating apparatus constructed in ac cordance with the invention. isillustrated in the accompanying drawings in which Figs. 1 and 2 show oneembodiment, Fig. 1 being a front view and Fig. 2 a section on the line22 of Fig. 1; Figs. 3 and 4 are like views showing another embodiment,Fig. 3 being a front view and Fig. 4 a section substantially on the line4-4 of Fig. 3; Figs. 5 and 6 are like views showing yet anotherembodiment, Fig. 5 being a front view and Fig. 6 a section on the line66 of Fig. 5; Figs. 7 and 8 are fragmentary sectional views showingmodifications in which the apparatus is applied to a main air trunk.

Like reference characters denote similar parts in the several views. 1

In the construction shown in Figs. 1 and 2 there is attached to thedelivery end of an air supply trunk 1 a box 2 the front wall 3 of whichis constituted by a low velocity grid type louvre. 4 denotes alongitudinal division plate disposed centrally within the box 2substantially parallel to the louvre out let so as to'divide the aircurrent issuing from the trunk 1 into two streams. The division plate 4stops short of that endof the box 2*remote from the trunk 1, fittedwithin the box at whichend is a concaved deflecting plate 5. Pivoted at6'to the end of the plate 4'adjacent. to thetrunk 1 is an air-guidingflectedsoasto flow between tlie plate 4 and the wall 3 in the oppositedirection to 'the first stream. It will be understood that, withsuitable angular movement of the flap 7 equal dynamic effects may beimparted to the two streams of air so asto insure uniform distributionof air delivery through the louvre. i In the construction shown in Figs.3 and 4 the air supply trunk 1 is connected to the box 2' midway of thelength thereof, the trunk being 'e'onnectedto the rear wall of the boxas shown in full'lines in Fig. 4 or the trunk may beconnected'to one ofthe side walls of the box as shown in chain-dotted lines in Figs. 3 and4." Hingedly connected at 10 midway of the length of the box are a pairof angularly movable members 11 of a sectional division platell eachcarrying at its free end a nut 9 penetrated by a screw 8 journalled inthe wall 3. 5 denotes concaved deflecting plates fitted one in each endof the box. As

shown by the arrows in Fig. 4, air entering the box from the trunk 1 isdivided into two streams flowing in opposite directions between the rearwall of the box and the division plates 11 towards the concaveddeflecting plates 5 by which the direction of flow is reversed thestreams returning between the plates 11 and the wall 3. It will beunder-.

stood that, with suitable angular adjustment of the plates 11 uniformdistribution of air delivery through the louvre may be ensured.

In the construction shown in Figs. 5 and 6 the air trunk 1 is connectedto the box 2 as in the construction shown in Figs. 3 and 4. Locatedwithin the box is a bent division plate 12 midway of which is pivoted at13 an air deflecting plate '14 angularly movable by adjustment of ascrew 8 penetrating the division plate 12 and journalled in the wall 3.5 denotes concaved deflecting plates fitted one in each end of the box.It will be understood that the plate 14 divides the incoming air currentinto streams flowing in opposite directions towards the concaveddeflecting plates 5, and there reversed so as to return between theplate 12 and the wall 3. V In the construction shown in Fig. 7 there isfitted into. a main air trunk 15, so as partially to intercept the aircurrent a box 2 having an open end 16 opposed to the direction of airflow through the trunk 15. In register with the box is a louvre 3secured to the trunk 15. Fitted within the box 2 is a division plate 4pivoted to which is an angularly movable guiding plate 7 as in theconstruction shown in Figs. 1 and 2. r

In the arrangement shown in Fig. 8 a box 2 provided with a louvre 3 andinternal bent.

division plate 12 is secured to the exterior of a main air trunk 15 overan opening 17 formed therein. i

Ventilating apparatus, comprising, in combination with an air trunk, acasing one side wallof which presents an air outlet, the opposite sidewall of said casing being connected to said airtrunk, a sectionaldivision plate in said casing interposed between said casing side walls,the ends of said division plate beingspaced from the end Walls of saidcasing, said division plate extending substantially parallel to theplane of said. outlet, said division plate positioned to divide the airentering said casing from said trunk into two streams flowing inopposite directions, means for effecting angular adjustment of thesections of said division plate, and concaved deflectors interposedbetween the ends of said division plate and the end walls ofsaid-casing. e i V r In testimony whereof I have signed my name to thisspecification.

ALEXANDER WILLIAM STEWART.

